astronomy

PKS 2354−35

PKS 2354−35 is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand PKS 2354−35 rather than just read about it. In short: PKS 2354−35 also designated as ESO 349-010, is a type-cD galaxy located in the constellation of Sculptor. The redshift of the galaxy is (z) 0.049 and it was first discovered as an extragalactic radio source by astronomers in December 1965, whom they identified it with a spherical object surrounded by a diffused envelope.

Key takeaways

PKS 2354−35 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PKS 2354−35 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 2354−35 from memory before moving on to harder problems.

Reference excerpt

PKS 2354−35 also designated as ESO 349-010, is a type-cD galaxy located in the constellation of Sculptor. The redshift of the galaxy is (z) 0.049 and it was first discovered as an extragalactic radio source by astronomers in December 1965, whom they identified it with a spherical object surrounded by a diffused envelope. It is classified as a radio galaxy and is the brightest cluster galaxy in Abell 4059.

Description PKS 2354−35 is a cD galaxy dominating the center of Abell 4059. It has also been categorized as a Type I Fanaroff-Riley class radio galaxy and contains dust absorption features in its center when imaged by Hubble Space Telescope (HST). The radial profile of the galaxy is found to display no signs of rotation but the velocity dispersion profile is mainly positive. The optical spectrum of the galaxy contains both doubly ionized oxygen and ionized neon lines. The radio source of PKS 2354−35 is found to be compact. When observed, it has a radio core component shown to have a size of around 0.4 arcseconds with a flux density of seven mJy. There is a presence of jet structure on both sides of the source. The radio spectrum has been described as extremely steep and the total radio luminosity has been calculated as 1.5 × 1042 erg s−1. Two radio lobes have been detected in the galaxy, depicted as extending along a major axis and positioned perpendicularly towards an X-ray bar feature. HST imaging have also detected the presence of a dust lane in PKS 2354−35. When observed, the dust lane is shown to shown an extension of five arcseconds across with a projection across the central region. Evidence also found the dust lane is mainly twisted with a position angle of between 60° to 70° in relation to the galaxy's own radio axis. This suggested a recent galaxy merger around 108 million years ago. The central supermassive black hole has been estimated as 0.7+1.0-0.4 × 109 M☉ based on a factor adjustment of 0.35, with an Eddington ratio of 1.2+4.6-0.9 × 10−3 Medd. A pair of X-ray cavities have been discovered inside a central region along with X-ray emission ridge that is associated with the galaxy. Evidence also suggested the galaxy's nucleus may be activated through tidal stripping of cold gas from a late-type starburst galaxy based on asymmetries of the interstellar medium.

References

Illustrations

Worked examples

Example 1 — a first encounter with PKS 2354−35

Start with the simplest possible case. Write down what PKS 2354−35 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to PKS 2354−35 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about PKS 2354−35 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of PKS 2354−35

In research: PKS 2354−35 appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses PKS 2354−35 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: PKS 2354−35 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1965, ESO objects, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 2354−35 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study PKS 2354−35 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 2354−35 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain PKS 2354−35 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 2354−35 in simple terms?

Why does PKS 2354−35 matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study PKS 2354−35?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on PKS 2354−35.